I only get hot bath water when cold tap in sink is turned on why?

I have 1.5 baths and every morning after my daughter takes her shower it's my turn and I'm getting in to cold water. This just started about a year or so ago. I've turned up my hot water heater to max that won't cause any problems but I'm still taking a practically cold shower every morning.

Ok here is my dilema.. I just purchased a newly built home. We are the 1st owners and everything was brand new..appliances, furnace boiler etc; I have scortching hot water everywhere but my master bath. I have 2 flrs and 2 full baths. Bathroom on 1st floor has hot water enough to fog up...

I have forced hot water baseboard heat. My two upstairs baseboards are cold when heat is fine in the rest of the lower house. I beld the unit and still it's cold. I pulled at least 2 quarts of water out but no air at all. Any sugesstions on what to do next. Thanks

I have NO cold running water coming out of bathroom taps . The hot is running fine. This just happened all of a sudden with no cause I can think of. I have both cold and hot water downstairs running fine. The bathroom is upstairs. Can you help me Thanks .